girdled head questions

chrisdoc0608

insulting
Location
rocky mount, nc
what would cause multiple threads to strip out of the cylinder while trying to torque the acorn nuts down on a girdled head? i chased the threads before installing the studs, put the studs all the way in and i have now officially stripped out 4 threads (in addition to two existing helicoils), 2 stripped out at 13ft/lbs and two at 18... looks like helicolis are on the way :(
 
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